Geographical globe.



No. 648,117 Patmited Apr. 24, I900.

' J. S. STUBBLEFIELD.

l GEOGRAPHICAL GLOBE.

(Application filed May 11. "1899.)

(No Model.)

UNITED STATES PATENT OFFICE.

JOHN S. STUBBLEFIELD, OF LOS ANGELES, CALIFORNIA.

GEOGRAPHICAL GLOBE.

SPECIFICATION forming part of Letters Patent N 0. 648,1 17, dated April24,1900. Application filed May 11, 1899. Serial No- 716,453. (No model.)

To all whom it may concern;

Be it known that 1, JOHN S. STUBBLEFIELD, residing at Los Angeles, inthe county of Los Angeles and State of California, have invented a newand useful Geographical Globe, of which the following is aspecification.

The object of my invention is to provide superior means for teachinggeography; and it relates particularly to the explanation of themagnetic phenomena of the earth.'

My invention comprises a geographical globe provided with a magnet thenorth pole of which is located in the globe to correspond with themagnetic north pole .of the earth.

My invention may be applied in various ways, and embraces the variousfeatures and combinations hereinafter described and claimed.

The accompanying drawings illustrate my invention as applied to schoolgeographical globes. The map-surface is omitted in Fig- I ures 1, 2, 3,and 4.

Fig. 1 is a view of a globe provided with a single permanent magnet toindicate a north magnetic pole of the earth. A portion of the globe isbroken away to expose the magnet. Fig. 2 is a like View of a globeprovided with a single electromagnet. Fig. 3 is a view of a globeprovided with magnets the north poles of which are arranged relativelythe same as the north magnetic poles of the earth. Fig. 4 is a view of aglobe with electromagnets the north poles of which are arranged tocorrespond with the north magnetic poles of the earth. Fig. 5 is anenlarged fragmental scctional detail.

In the several views, A, A, A, and A indicate geographical globes.

1 represents the. north pole of the axis 0 the earth, and 2 the southpole of the axis of the earth.

B indicates a permanent magnet in globe A, the north pole of said magnetbeing located at N to represent a north magnetic pole of the earth andthe south pole of the magnet being located in the Southern Hemisphere,as indicated at S. In Fig. 2, B indicates an electromagnet arranged in asimilar manner in globe A. Z) indicates the conductor, lead ing throughthe south pole 2 of the axis of rotation into the interior of the globeA to energize the core 3 of the magnet.

The form shown in Figs. 1 and 2 may ordi narily be used in the commonschools, and the north pole of the magnet will be located to correspondwith the north magnetic pole of the Western Hemisphere.

In Fig. 3, B" indicates a main magnet, and b" a submagnet, the mainmagnet being located to correspond with the magnetic pole in the WesternHemisphere and the north pole of the magnet I)" being located tocorrespond with the magnetic pole in Siberia.

' In Fig. 4, 13' indicates an electromagnet the north pole N of which islocated'to corre spoud with the magnetic pole of the Vestern Hemisphere,and b is an electromagnet the north pole N of which is located tocorrespond with the north magnetic pole in Siberia. The conductors 1 inthis form lead out at the axis of rotation the same as in the form shownin Fig. 2.

In the several views, 0 indicates magnetic meridians, which arepreferably composed of metallic bars or strips arranged at or near thesurface of the globe and which extend along lines indicated by thevariation of the magnetic needle on the earths surface in the WesternHemisphere. These bars or strips lead to the north pole of the magnetlocated in the IVestern Hemisphere. 0 indicates like metallic bars orstrips leading to the north magnetic pole N, indicated in Siberia.

D indicates a compass which in practical use of the globe will be movedabout on the surface of the globe, thus to exhibit to the pupil theaction of the magnetic currents of the earth upon the magnetic needle.

The electromagnetic arrangement is preferable where available, suchmagnet being stronger than the permanent magnet, and the passing of thecurrent around it may also be used to illustrate the electric currentpassing around the earth and which forms the mag netic poles of theearth.

The magnetic meridians O O are for the purpose of strengthening andhelping to maintain the magnetism, especially in the perma nent magnet.They also give direction to the compass-needle, and Where thecompass-needle varies from the magnetic .poles the me ridians may bebent and located to indicate this variation. Said meridians should bebent so as to show the lines of magnetic force as they are supposed tobe on the earth. The meridians and also the magnetic poles may be sunk alittle below the surface of the globe and the map-surface S be mountedover them, as indicated in Fig. 5, and they may or may not be indicatedon the surface of the unfinished globe.

Now, having described my invention, what I claim as new, and desire tosecure by Letters Patent, is g 1. A geographical globe provided with amagnet, the north pole of which is located in the globe to correspondwith a magnetic north pole of the earth.

2. A geographical globe provided with two magnets, the north poles ofwhich are located in the globe to correspond with the magnetic northpoles of the earth respectively.

3. A geographical globe provided with an electromagnet, the north poleof which is lo.- cated in the globe to correspond with a magnetic northpole of the earth.

4. A geographical globe provided with two electromagnets, the northpoles of which are magnet, the south pole of which is in the SouthernHemisphere and the north pole in the Northern Hemisphere substantiallyas and for the purpose set forth.

7. A geographical globe provided with an electromagnet, the south poleof which is in the Southern Hemishere and the north pole in the NorthernHemisphere substantially as and for the purpose set forth.

JOHN S. STUBBLEFIELD. \Vitnesses:

JAMES R. TO\VNSEND, F. M. TowNsEND.

